Abstract: This paper proposed a novel coordinated control strategy for the enhanced capacitor commutated converter（ECCC） based on anti-parallel thyristor full bridge sub module（APT-FBSM）. The novel coordinated control strategy can bring the following significant benefits: 1) the ability of ECCC system to mitigate the commutation failure is no longer affected by the fault detection delay. The capacitor inside the APT-FBSM can directly participate in the commutation process and further reduces the probability of commutation failure; 2) When the system is operating normally, the series-connected capacitors can accelerate the commutation process and increase the margin for successful commutation; 3) The inserted capacitors can output reactive power, increase the power factor, reduce the reactive power consumption of the converter and the required reactive power compensation capacity of the AC system. Firstly, the mechanism of the proposed control strategy to accelerate commutation process and improve the power factor was analyzed. The novel coordinated control strategy was introduced in detail. Secondly, the ability to mitigate the commutation failure（CF） under the proposed control strategy and the existing approach was compared. Finally, the detailed electromagnetic transient（EMT） model was developed to validate the effectiveness of the presented control strategy. The results show that the proposed approach can not only increase the system power factor, but also further reduce the probability of commutation failures.